JP2014205948A - Ceiling structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ceiling structure that prevents a suspended ceiling member from falling.SOLUTION: A ceiling 10 includes: a suspended ceiling member 16 that is suspended from a ceiling slab 12 by a suspension member 14; hanging members 22 and 24 that pass through the suspended ceiling member 16 and that are fixed to the ceiling slab 12; and fall prevention members 30 and 32 that are suspended by the hanging members 22 and 24 and that are expanded below the suspended ceiling member 16.

Description

  The present invention relates to a ceiling structure.

A ceiling member suspended from a ceiling slab of a building by a suspension member is a complex ramping action and braking of multiple components linked to sudden impact loads such as earthquakes, even if the building frame has sufficient seismic strength. Problems such as falling off from the suspension member due to “reaction force” or causing functional failure are assumed.
For this reason, in particular, the government building that is the base for implementing disaster emergency measures, disaster prevention facilities such as gymnasiums that are designated as evacuation sites, and theaters, movie theaters, theaters, and viewing venues that have seats that are designated as fixed disaster prevention bases. In places, public halls, meeting halls, etc., even if an earthquake occurs, there is a need for a ceiling structure that prevents the ceiling members from falling to the floor and does not harm people.
For example, Patent Document 1 discloses a ceiling material fall prevention technique.

Patent document 1 is the inside of a room provided in an existing building. A vertical body (column) is newly erected at the four corners, and a horizontal body (beam) is bridged between the vertical bodies. It is the structure which connects a vertical body and a horizontal body by an edge part. At this time, the lower end portion of the vertical body is brought into contact with the ground surface of the building, and the upper end portion of the vertical body is positioned below the existing ceiling.
Further, at the top of the vertical body, a plurality of horizontal bodies (beams) are attached at predetermined intervals into a rectangular frame formed by a horizontal body of four sides. In addition, a net is stretched on the horizontal frame in the frame. Thereby, in addition to reinforcement of the existing building, the net body catches the fall of the ceiling material.

JP 2003-120045 A

However, Patent Document 1 is an invention that mainly focuses on seismic reinforcement of buildings with low seismic strength, and has a structure in which columns, beams, and small beams are newly constructed in a room. The building frame has sufficient seismic strength, and it is not appropriate to apply it to a building that prevents only the ceiling material from falling.
An object of this invention is to provide the ceiling structure which prevents the fall of a suspended ceiling member in view of the said fact.

  The ceiling structure according to the first aspect of the invention includes a suspended ceiling member suspended from a ceiling slab by a suspension member, a suspension member penetrating the suspended ceiling member and fixed to the ceiling slab, and the suspension A fall prevention member supported by the member and deployed below the suspended ceiling member.

  According to the first aspect of the present invention, even if the suspended ceiling member falls off from the suspended member during an earthquake or the like, it is received by the fall prevention member deployed below the suspended ceiling member and falls to the floor surface. There is no. Even if the suspension member falls off the ceiling slab, the fall prevention member is supported by the suspension member fixed to the ceiling slab separately from the suspension member. Will not fall to the floor.

According to a second aspect of the present invention, in the ceiling structure according to the first aspect, the suspension member passes through an opening of a facility attachment port provided in the suspension ceiling member, or a newly opened opening. It is fixed to the ceiling slab.
According to the second aspect of the present invention, the suspension member is fixed to the ceiling slab through the opening of the facility attachment port to which illumination, a speaker, and the like are attached. For this reason, it is not necessary to provide an opening for the suspension member separately in the suspension ceiling member. In addition, when the upper part of the opening of the equipment attachment port is blocked by, for example, a duct or when there is no equipment attachment port at an appropriate position, a new opening is provided and the suspension member is attached to the ceiling slab. Fix it.

According to a third aspect of the present invention, in the ceiling structure according to the first or second aspect, the fall prevention member is a net material, a film material, or a mesh hardware.
According to the third aspect of the present invention, a net material, a film material, or a mesh hardware can be developed along a suspended ceiling member even on a slanted ceiling such as a movie theater ceiling. Moreover, it is hard to become obstructive of the light of the illumination provided in the suspended ceiling member.

According to a fourth aspect of the present invention, in the ceiling structure according to the third aspect, an outer peripheral portion of the mesh material or the film material is connected to a wall.
Thereby, a net | network material or a film | membrane material becomes difficult to shake. Further, since the support points of the net material or the film material are increased, the support strength is increased.

According to a fifth aspect of the present invention, in the ceiling structure according to any one of the first to fourth aspects, the suspension member includes a connecting member connected to the fall prevention member. .
Thereby, the connection member corresponding to the structure of the fall prevention member can be attached to the suspension member, and the connection of the fall prevention member to the suspension member can be facilitated.

Invention of Claim 6 is the ceiling structure of any one of Claims 1-5, The said suspension member is provided with the ceiling slab fixture fixed to the said ceiling slab, and is arrange | positioned diagonally, A reinforcing member for connecting the ceiling slab fixture and the suspended ceiling member is provided.
By suspending the ceiling member obliquely with the reinforcing member, shaking and deformation of the ceiling member during an earthquake or the like can be suppressed, and falling or damage of the ceiling member can be suppressed.

  Since this invention is set as the said structure, it can provide the ceiling structure which prevents the fall of a suspended ceiling member.

These are vertical sectional views showing the basic configuration of the ceiling structure according to the first embodiment of the present invention. (A) is the elements on larger scale of the junction part of the fall prevention member in the ceiling structure which concerns on 1st Embodiment of this invention, (B) is the perspective view. These are vertical sectional views showing the basic configuration of the ceiling structure according to the second embodiment of the present invention. (A) is the vertical sectional view of the connection member which shows the basic composition of the ceiling structure concerning a 3rd embodiment of the present invention, and (B) is the perspective view. (A) is the vertical sectional view of the connection member which shows the basic composition of the ceiling structure concerning a 3rd embodiment of the present invention, and (B) is the top view looked up from the lower part. (A)-(D) are perspective views which show the construction procedure of the fall prevention member in the ceiling structure which concerns on 3rd Embodiment of this invention. (E)-(G) are perspective views which show the construction procedure of the fall prevention member in the ceiling structure which concerns on 3rd Embodiment of this invention. It is a perspective view of the connection member which shows the basic composition of the ceiling structure which concerns on 4th Embodiment of this invention. (A) is the vertical sectional view of the connection member which shows the basic composition of the ceiling structure concerning a 4th embodiment of the present invention, and (B) is the top view looked up from the lower part. (A)-(C) are perspective views which show the construction procedure of the fall prevention member in the ceiling structure which concerns on 4th Embodiment of this invention. (D)-(F) is a perspective view which shows the construction procedure of the fall prevention member in the ceiling structure which concerns on 4th Embodiment of this invention.

(First embodiment)
The ceiling structure according to the first embodiment will be described with reference to FIGS. 1 and 2.
The ceiling 10 has an existing suspended ceiling member 16 suspended from a ceiling slab 12 by a suspension bolt 14 and a connection fitting 15 joined to the lower end portion of the suspension bolt 14.
The suspended ceiling member 16 includes a ceiling board 20 (including a ceiling panel) and a ceiling base 18 that supports the ceiling board 20. The ceiling base 18 is made of a lightweight steel frame, wood, or the like in a plan view, and is joined to a suspension bolt 14 fixed to the ceiling slab 12 via a connection fitting 15. The ceiling board 20 is formed of gypsum board, wood, or the like, and constitutes the ceiling surface of the indoor space 56. In FIG. 1, the ceiling board 20 has an example of a double structure in which two pieces are stacked in a vertical direction with a predetermined gap. Here, a space between the ceiling slab 12 and the suspended ceiling member 16 is a ceiling back space 54, and a space below the suspended ceiling member 16 is an indoor space 56.

In the indoor space 56 below the ceiling board 20, a net 32 knitted with a net material is laid (deployed) as a fall prevention member. The net 32 is received below the ceiling board 20 so that when the ceiling board 20 falls off the suspension bolt 14 due to an earthquake or the like, the fragments of the suspension ceiling member 16 fall to the floor surface and do not damage the human body. And hold. In order to achieve this object, the type and strength of the net 32 and the mesh sizes d1 and d2 of the net are determined (see FIG. 2B).
The net 32 is suspended by anchor bolts (eye bolts) 22 fixed to the ceiling slab 12 above the opening (downlight attachment port) 34 of the suspended ceiling member 16 as described in the construction method described later. Has been. That is, the suspension wire 24 is suspended from the anchor bolt 22, and a connection pipe 26 that is a connection member is supported on the lower end portion of the suspension wire 24. In addition, a cross metal fitting 28 is attached to the lower end of the connecting pipe 26, and a net wire 30 is attached to the cross metal fitting 28. A net wire 30 supports the periphery of the net 32.

That is, as shown in FIGS. 2A and 2B, a suspension wire 24 is suspended from the anchor bolt 22, and a cylindrical connection pipe 26 is connected to the lower end of the suspension wire 24. An eye bolt 27 is screwed into the upper end portion of the connection pipe 26 and is connected to the lower end portion of the suspension wire 24 by the eye bolt 27. A cross metal fitting 28 is joined to the lower end of the connecting pipe 26.
The cross metal fitting 28 is joined to the lower side of the ceiling board 20 and has a flat plate portion that protrudes in four directions from the connecting pipe 26 in a cross shape. Each flat plate portion is provided with a through hole, and a net wire 30 is connected to each through hole. The wire 30 for nets is arrange | positioned at the grid | lattice form by planar view, and the cross metal fitting 28 is arrange | positioned at the cross | intersection part of the wire 30 for nets.

  Further, the net wire 30 is passed in a lattice shape in plan view, and a net 32 knitted with a net material is laid between the grids formed by the net wire 30. The periphery of the net 32 is fixed to the net wire 30 with clips or the like as appropriate. The net 32 is installed on the lower side of the ceiling board 20 along the ceiling board 20 so that the gap with the ceiling board 20 is as small as possible (as close to the ceiling board 20 as possible) so that there is no slack. Further, the end of the net wire 30 is joined to the wall penetration bolt 58 and connected to the wall 38 on the indoor space side 56. Thereby, the circumference | surroundings of the net 32 are fixed with the wall penetration bolt 58, and the net 32 becomes difficult to shake. At the same time, since the support points of the net 32 are increased, the support strength of the net 32 is increased.

By adopting this configuration, even if the ceiling board 20 drops off from the suspension bolt 14 in the event of an earthquake, the ceiling board 20 is received by the net 32 deployed below the ceiling board 20 and prevented from falling onto the floor surface. Is done. Even if the suspension bolt 14 falls off the ceiling slab, the net 32 is supported by the anchor bolts 22 fixed to the ceiling slab 12 separately from the suspension bolt 14, and the net 32 receives the fall of the ceiling board 20. Thus, it is possible to prevent the floor from falling.
Further, the anchor bolt 22 is fixed to the ceiling slab 12 through a downlight attachment port 34 provided in the ceiling board 20. That is, the anchor bolt 22 is fixed to the ceiling slab 12 through the downlight attachment port 34. For this reason, it is not necessary to provide the ceiling board 20 with an opening for constructing the anchor bolt 22 separately. The downlight mounting port 34 is provided with a frame member 35 that surrounds the end portion, and a lower cover part 39 that covers the opening is provided at the lower end portion of the downlight mounting port 34. Thereby, the downlight attachment port 34 can be protected and reinforced, and the design can be enhanced.
Furthermore, the downlight 36 of the existing illumination which was removed can be attached to the lower end part of the connection pipe 26. As a result, the downlight 36 can be mounted at almost the same position as in the prior art, and the indoor lighting environment can be maintained without being affected by the net 32. At this time, the illumination wiring 37 may be drawn into the downlight 36 using the internal space of the connection pipe 26.

  Although an illustration is omitted as an example of development, the net 32 can be developed along the ceiling board 20 even on a slanted ceiling such as the ceiling of a movie theater. In this case as well, a downlight 36 is provided at the lower end of the connecting pipe 26, and the net 32 is unlikely to obstruct light. Further, the anchor bolt 22 and the net 32 are connected via a connecting pipe 26 and a cross fitting 28. Thereby, the connection of the net 32 to the anchor bolt 22 can be facilitated by attaching the connection pipe 26 corresponding to the configuration of the net 32 to the lower part of the suspension wire 24 suspended from the anchor bolt 22.

As described above, according to the present embodiment, conventionally, a part of the ceiling is disassembled and the anchor bolt 22 is driven, and the suspension wire 24 is suspended by the anchor bolt 22. These constructions can be performed without dismantling. In addition, conventionally, it has been necessary to newly open an opening for allowing the suspension wire 24 to pass through the ceiling board 20, but it is necessary to provide a new opening by using the opening of the downlight 36. Disappear. At this time, the downlight 36 and the suspension wire 24 can be integrated.
Furthermore, in this embodiment, in addition to the conventional suspension bolt 14, an anchor bolt 22 is newly placed on the ceiling slab 12, and the net 32 is supported on the anchor bolt 22. Thereby, fall prevention of the ceiling board 20 can be achieved more reliably. The anchor bolt 22 has been described by taking an eye bolt as an example, but is not limited to this, and the anchor bolt 22 having another structure may be used.

Next, the construction method of the ceiling 10 will be described.
First, the process of removing the downlight 36 from the ceiling board 20 of the existing suspended ceiling member 16 suspended from the ceiling slab 12 with the suspension bolt 14 is executed. This is for utilizing the opening of the downlight mounting opening 34 provided in the ceiling board 20.
Next, through the downlight attachment port 34 of the ceiling board 20 from which the downlight 36 is removed, a mounting hole for the anchor bolt 22 is made in the ceiling slab 12 from the lower side to the upper side, and the anchor bolt 22 is fixed to the ceiling slab 12. Execute the process. By newly fixing the anchor bolt 22 to the ceiling slab 12, the ceiling board 20 can be reliably prevented from falling.
Next, the process of attaching the suspension wire 24 to the anchor bolt 22 and attaching the connecting pipe 26 to the lower end of the wire 24 is executed. A cross metal fitting 28 is joined to the lower end portion of the connecting pipe 26, and the cross metal fitting 28 is projected from the lower surface of the ceiling board 20 to the indoor space side 56.
Finally, the process of attaching the wire 30 for nets to the cross metal fitting 28, and attaching the circumference | surroundings of the net 32 to the wire 30 for nets is performed. Thereby, the net 32 can be developed below the ceiling board 20. At this time, since the cross fitting 28 protrudes from the ceiling board 20 to the indoor space side 56, the net wire 30 and the net 32 can be easily joined.

Through these steps, the net 32 can be provided below the ceiling board 20 using the anchor bolts 22 fixed to the ceiling slab 12. As a result, even if the ceiling board 20 falls off the suspension bolt 14, the net 32 receives the ceiling board 20 and holds the ceiling board 20. That is, the net 32 can prevent the ceiling board 20 from falling onto the floor surface. Here, the anchor bolt 22 is joined to the upper ceiling slab 12 of the downlight attachment port 34 of the ceiling board 20 from which the downlight 36 is removed, and can be constructed without dismantling the ceiling board 20. .

The above description has been made with the existing suspended ceiling member 16. However, the present invention is not limited to this, and a newly built suspended ceiling member may be used. In addition, the ceiling board 20 has been described as having a double structure that is doubled in the vertical direction, but may be a single structure or a triple structure or more. Moreover, although the net 32 demonstrated the case of the net | network material, it is not limited to this, For example, the structure which expand | deployed the film | membrane material under the ceiling board 20 similarly to the net | network material may be sufficient.
Moreover, the opening part of the ceiling board 20 demonstrated by the opening after removing the downlight attachment port 34. FIG. However, the present invention is not limited to this, and although not shown in the drawings, it may be an attachment port such as another lighting device or a speaker. Furthermore, when the upper part of the opening part of the facility attachment port is blocked by, for example, a duct or when there is no opening part of the facility attachment port at an appropriate position, a new opening part is provided and a new one is provided. The anchor bolt 22 may be fixed to the ceiling slab using the opening, and the net 32 may be suspended by the anchor bolt 22. The term “opening” generally refers to a new opening that avoids interference with installation piping for lighting, air conditioning, exhaust, watering, sensors, etc., and existing inspection openings, as well as equipment piping on the back of the ceiling.

(Second Embodiment)
A ceiling structure according to the second embodiment of the present invention will be described with reference to FIG.
The ceiling 90 according to the present embodiment is different from the first embodiment in that the suspended ceiling member 16 is reinforced using the reinforcing member 78. The difference will be mainly described.
As shown in FIG. 3, one end of the reinforcing wire 78 is attached to the anchor bolt 22 fixed to the ceiling slab 12 in addition to the suspension wire 24, and the other end of the reinforcing wire 78 is attached to the ceiling base material 18. ing.
A plurality of reinforcing wires 78 are used, and are attached obliquely to the vertical direction in opposite directions. At this time, the reinforcing wire 78 and the ceiling base material 18 may be attached by, for example, winding the ceiling wire 18 around the ceiling base material 18 using the crossing portion of the ceiling base material 18 and stopping with the stop belt 79. Alternatively, the ceiling base material 18 may be wound around the connecting member 15 and suspended by the retaining belt 79. Thereby, the reinforcing wire 78 can be attached more reliably.

The suspension wire 24 suspends and supports the suspended ceiling member 16 in the vertical direction. On the other hand, the reinforcing wire 78 supports the suspended ceiling member 16 by suspending it diagonally. The support strength in the horizontal direction of the suspended ceiling member 16 is reinforced by suspending the ceiling base 18 obliquely from opposite directions with a plurality of reinforcing wires 78.
Thereby, the shaking and deformation | transformation of the ceiling board 20 at the time of an earthquake etc. are suppressed, and the fall and damage of the ceiling board 20 resulting from a shaking and a deformation | transformation can be suppressed.
Others are the same as 1st Embodiment, and description is abbreviate | omitted.

(Third embodiment)
The ceiling structure according to the second embodiment of the present invention will be described with reference to FIGS.
The ceiling 80 according to the present embodiment is different from the first embodiment in that the net 32 made of a net material is a steel metal fitting 60 made of steel. The difference will be mainly described.
As shown in a vertical sectional view of FIG. 4A, a perspective view of FIG. 4B, a vertical sectional view of FIG. 5A, and a plan view looking up from the bottom of FIG. The main frame 72 is attached to the opening 82 from which the downlight 36 has been removed, closing the opening 82. The main frame 72 is formed of a steel plate or a resin in a substantially U shape whose cross-sectional view is opened downward, has a width in which the downlight 36 is accommodated, and an arrangement direction in which a plurality of openings 82 are continuous. Is a length that continuously closes the plurality of openings 82.

The upper surface of the main frame 72 is in contact with the lower surface of the ceiling board 20 except for the opening 82, is suspended from above the opening 82, and is fixed to all screw bolts 84 whose upper end is fixed to the ceiling slab.
On both side surfaces of the main frame 72 in the longitudinal direction, concave portions 86 are formed that are bent inwardly over the entire width. The fall prevention frame 50 is inserted into the recess 86 at a predetermined interval. The fall prevention frame 50 is formed of a steel square and is arranged in a direction orthogonal to the main frame 72. The end of the fall prevention frame 50 is fixed with screws through a main frame 72 and an L-shaped metal fitting 74.
On the upper surface of the fall prevention frame 50, a plurality of grooves 64 are formed so as to match the mesh interval of the mesh hardware 60. Thereby, the steel material part of the mesh hardware 60 can be dropped into the groove part 64 from above. Since the mesh hardware 60 receives and holds the ceiling board 20, the mesh hardware 60 is formed in a lattice shape with a steel wire having a diameter that can receive and secure the holding strength. Moreover, it is attached along the ceiling board 20 at a position in contact with the ceiling board below the ceiling board 20.

  A flat plate stop plate 70 is attached to the lower end (open end) of the main frame 72. The stopper plate 70 is formed of a steel plate or resin in a flat plate shape, and closes the lower end portion over the entire length of the main frame 48. Thereby, the opening part of a lower end part is closed, and the intensity | strength of the main frame 48 can be increased. Further, a through-hole into which the downlight 36 is inserted at a predetermined interval is formed in the stopper plate 70, and the removed downlight 36 is attached to the through-hole. At this time, for example, if there is other equipment such as a smoke sensor, the opening plate 70 is replaced. Further, the lower surface of the stopper plate 70 is painted to improve the design as a decorative plate.

Next, the ceiling construction procedure will be described with reference to FIGS.
First, as shown in FIGS. 6A and 6B, all the existing downlights 36 are once removed from the ceiling board 20. The downlight 36 is attached to the ceiling board 20 and can be easily removed.
Next, as shown in FIG. 6C, an unillustrated anchor hole is opened in the ceiling slab 12 with a drill 76 from below using the downlight attachment port 82 from which the downlight 36 has been removed. Thereafter, one end of all screw bolts 84 is fixed to the anchor hole, and one end is projected from the lower surface of the ceiling board 20.

Subsequently, as shown in FIG. 7E, the upper surface of the main frame 72 is brought into contact with and fixed to the lower surface of the ceiling board using all screw bolts 84. Subsequently, the fall prevention frame 50 is attached to the recess 86 formed on the side surface of the main frame 72. The fall prevention frame 50 is formed of steel square material, and is inserted into the recess 86 on the side wall of the main frame 72 at a predetermined interval.
That is, the fall prevention frame 50 is passed between the main frame 72 and the main frame 72 provided at a predetermined interval in a direction orthogonal to the main frame 72. Next, the mesh hardware 52 is dropped from above between the fall prevention frame 50 and the fall prevention frame.

  Finally, as shown in FIG. 7 (F), an opening prevention plate 70 provided with a through-hole for mounting the downlight 36 is attached to the lower end portion of the main frame 72. Thereby, the housing strength of the main frame 72 can be increased. Subsequently, the removed downlight 36 is attached to the through hole of the stopper plate 70. At this time, not only the downlight 36 but also equipment such as a smoke sensor is attached to the stop plate 70. Thereby, the construction of the ceiling 80 is completed. FIG. 7G shows the completed state. The downlight 36 and the mesh hardware 52 can be harmonized.

  As described above, the ceiling 80 according to the present embodiment is configured such that the mesh hardware 52 receives and holds the drop of the ceiling board 20. The mesh hardware 52 is formed in a flat plate shape, and an end portion is held by the fall prevention frame 50, and the fall prevention frame 50 is fixed to a recess 86 of the main frame 72 fixed to the ceiling slab 12 with all screw bolts 84. Thereby, the fall to the floor surface of the ceiling board 20 can be prevented. Other configurations are the same as those of the first embodiment, and a description thereof will be omitted.

(Fourth embodiment)
A ceiling structure according to a fourth embodiment of the present invention will be described with reference to FIGS.
The ceiling 40 according to the present embodiment is different from the first embodiment in that the existing illumination is not the downlight 36 but the line illumination 42, and the net 32 made of a mesh material is a mesh hardware 60 made of steel. The difference will be mainly described.
As shown in the perspective view of FIG. 8, the vertical cross-sectional view of FIG. 9A, and the plan view looking up from the bottom of FIG. 9B, the opening 62 from which the line illumination 42 of the ceiling board 20 is removed is closed, A main frame 48 is attached. The main frame 48 is substantially U-shaped in a cross-sectional view opening downward, has a width for accommodating the line illumination 42, and has a length for continuously closing the opening 62 from which the line illumination 42 is removed in the longitudinal direction. Is formed.

The upper surface of the main frame 48 is in contact with the lower surface of the ceiling board 20 excluding the opening 62, and the suspension bolt suspended from the ceiling slab 12 above the opening 62 (the suspension bolt with the line illumination 42 attached). A cap nut 46 is attached to the lower end of 44 and fixed with an extension bolt 45 connected by the cap nut 46.
Concave portions 88 bent in a concave shape are formed on both side surfaces of the main frame 48, and the fall prevention frames 50 are inserted into the concave portions 88 at predetermined intervals. The fall prevention frame 50 is arranged in a direction orthogonal to the side surface of the main frame 48, and the end of the fall prevention frame 50 is fixed with screws through the main frame 48 and L-shaped metal fittings 74.
On the upper surface of the fall prevention frame 50, a mesh hardware 60 as a fall prevention net is provided. At this time, a plurality of grooves 64 are formed on the upper surface of the fall prevention frame 50 so as to match the mesh interval of the mesh hardware 60, and the mesh hardware 60 is dropped into the grooves 64 from above. The mesh hardware 60 is formed in a lattice shape with a steel wire having a diameter that can secure the strength to receive and hold the ceiling board 20, and is attached below the ceiling board 20 along the ceiling board 20.

  Between the upper surface inside the main frame 48 and the recess 88, a base metal piece 66 having a substantially U-shaped cross section is inserted. The plane portion of the base metal is arranged so as to partition the inside of the main frame 48 at the position of the recess 88. The upper surface of the removed line illumination 42 is brought into contact with the bottom surface of the base metal piece 66 and fixed with screws. A flat decorative cover 68 is attached between the line illumination 42 and the line illumination 42 in the longitudinal direction of the main frame 48 to increase the strength of the casing of the main frame 48 and improve the design. .

Next, the ceiling construction procedure will be described with reference to FIGS.
First, as shown in FIGS. 10A and 10B, all the existing line lighting 42 is once removed from the ceiling board 20. The line illumination 42 is suspended from the ceiling slab 12 by two suspension bolts 44, and can be easily removed by loosening the nut. Thereby, the two suspension bolts 44 which suspended the line illumination 42 can be utilized.
Next, as shown in FIG. 10C, after removing the line illumination 42, a cap nut 46 is attached to the lower end of the suspension bolt 44. Subsequently, the U-shaped main frame 48 is attached with the extension bolt 45 using the cap nut 46. The main frame 48 is attached with the upper surface in contact with the lower surface of the ceiling board 20. A concave portion 88 that is bent inward is formed on a side surface of the main frame 48.

Next, as shown in FIG. 11D, the fall prevention frame 50 is attached using the recess 88 of the main frame 48. The fall prevention frame 50 is formed of steel square material, can be inserted into the side wall of the main frame 48, and is disposed between the main frame 48 and the main frame 48 provided at a predetermined interval in a direction orthogonal to the main frame 48. Is done. Thereafter, the mesh hardware 52 is dropped between the fall prevention frame 50 and the fall prevention frame 50.
Next, as shown in FIG. 11E, the base metal piece 66 is attached to the main frame 48, and the removed line illumination 42 is attached to the base metal piece 66. The line illumination 42 is joined to the base hardware 66 with screws. Thereby, the construction of the ceiling 40 is completed. FIG. 11F shows the completed state. The line illumination 42 and the mesh hardware 52 can be harmonized.

  With the configuration described above, the mesh hardware 52 receives and holds the drop of the ceiling board 20. The mesh hardware 52 is formed in a flat plate shape, and an end portion is held by the fall prevention frame 50. The fall prevention frame 50 is a main frame 72 fixed to the ceiling slab 12 with suspension bolts 44, cap nuts 46, and extension bolts 45. It is fixed to the recess 88. Thereby, the fall to the floor surface of the ceiling board 20 can be prevented. Other configurations are the same as those of the first embodiment, and a description thereof will be omitted.

10, 40, 80, 90 Ceiling 12 Ceiling slab 14 Suspension bolt (suspending member)
15 Connecting bracket (suspending member)
16 Suspended ceiling member 18 Ceiling base (suspended ceiling member)
20 Ceiling board (suspended ceiling member)
22 Anchor bolt (hanging member, ceiling slab fixture)
24 Hanging wire (suspending member)
26 Connection pipe (connection member, suspension member)
30 Wire for net (fall prevention member)
32 Net (network material, fall prevention member)
34 Downlight mounting port (equipment mounting port)
48, 72 Main frame (connection member)
52 Mesh hardware (fall prevention member)
78 Reinforcing wire (Reinforcing member)

Claims (6)

A suspended ceiling member suspended from a ceiling slab with a suspension member;
A suspension member penetrating the suspension ceiling member and fixed to the ceiling slab;
A fall prevention member supported by the suspension member and deployed below the suspension ceiling member;
With ceiling structure.   The ceiling structure according to claim 1, wherein the suspension member is fixed to the ceiling slab through an opening of a facility attachment opening provided in the suspension ceiling member or a newly opened opening.   The ceiling structure according to claim 1, wherein the fall prevention member is a net material, a film material, or a mesh hardware.   The ceiling structure according to claim 3, wherein an outer peripheral portion of the mesh material or the film material is connected to a wall.   The ceiling structure according to claim 1, wherein the suspension member includes a connection member that is connected to the fall prevention member.   The said suspension member is provided with the ceiling slab fixture fixed to the said ceiling slab, it is arrange | positioned diagonally and the reinforcement member which connects the said ceiling slab fixture and the said suspension ceiling member is provided. The ceiling structure according to item 1.

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